Hello, here's a questions I was wondering if any of you could solve. I don't have the exact numbers, but the scenario is this: a guy standing on the Earth throws a ball upwards and catches it a few seconds later. How does would affect the potential energy and/or mechanical energy of the ball-Earth system? (Specifically, how might the graph of energy vs. time look like?) Then, how would this affect the potential energy and/or mechanical energy of the ball-Earth-Moon system? Any responses would be much appreciated. Thanks.